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        <a href="../.." >Object 对象</a>
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                                <section class="normal markdown-section">
                                
                                <h1 id="object-&#x5BF9;&#x8C61;">Object &#x5BF9;&#x8C61;</h1>
<h2 id="&#x6982;&#x8FF0;">&#x6982;&#x8FF0;</h2>
<p>JavaScript &#x539F;&#x751F;&#x63D0;&#x4F9B;<code>Object</code>&#x5BF9;&#x8C61;&#xFF08;&#x6CE8;&#x610F;&#x8D77;&#x9996;&#x7684;<code>O</code>&#x662F;&#x5927;&#x5199;&#xFF09;&#xFF0C;&#x672C;&#x7AE0;&#x4ECB;&#x7ECD;&#x8BE5;&#x5BF9;&#x8C61;&#x539F;&#x751F;&#x7684;&#x5404;&#x79CD;&#x65B9;&#x6CD5;&#x3002;</p>
<p>JavaScript &#x7684;&#x6240;&#x6709;&#x5176;&#x4ED6;&#x5BF9;&#x8C61;&#x90FD;&#x7EE7;&#x627F;&#x81EA;<code>Object</code>&#x5BF9;&#x8C61;&#xFF0C;&#x5373;&#x90A3;&#x4E9B;&#x5BF9;&#x8C61;&#x90FD;&#x662F;<code>Object</code>&#x7684;&#x5B9E;&#x4F8B;&#x3002;</p>
<p><code>Object</code>&#x5BF9;&#x8C61;&#x7684;&#x539F;&#x751F;&#x65B9;&#x6CD5;&#x5206;&#x6210;&#x4E24;&#x7C7B;&#xFF1A;<code>Object</code>&#x672C;&#x8EAB;&#x7684;&#x65B9;&#x6CD5;&#x4E0E;<code>Object</code>&#x7684;&#x5B9E;&#x4F8B;&#x65B9;&#x6CD5;&#x3002;</p>
<p><strong>&#xFF08;1&#xFF09;<code>Object</code>&#x5BF9;&#x8C61;&#x672C;&#x8EAB;&#x7684;&#x65B9;&#x6CD5;</strong></p>
<p>&#x6240;&#x8C13;&#x201C;&#x672C;&#x8EAB;&#x7684;&#x65B9;&#x6CD5;&#x201D;&#x5C31;&#x662F;&#x76F4;&#x63A5;&#x5B9A;&#x4E49;&#x5728;<code>Object</code>&#x5BF9;&#x8C61;&#x7684;&#x65B9;&#x6CD5;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-built_in">Object</span>.print = <span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params">o</span>) </span>{ <span class="hljs-built_in">console</span>.log(o) };
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;<code>print</code>&#x65B9;&#x6CD5;&#x5C31;&#x662F;&#x76F4;&#x63A5;&#x5B9A;&#x4E49;&#x5728;<code>Object</code>&#x5BF9;&#x8C61;&#x4E0A;&#x3002;</p>
<p><strong>&#xFF08;2&#xFF09;<code>Object</code>&#x7684;&#x5B9E;&#x4F8B;&#x65B9;&#x6CD5;</strong></p>
<p>&#x6240;&#x8C13;&#x5B9E;&#x4F8B;&#x65B9;&#x6CD5;&#x5C31;&#x662F;&#x5B9A;&#x4E49;&#x5728;<code>Object</code>&#x539F;&#x578B;&#x5BF9;&#x8C61;<code>Object.prototype</code>&#x4E0A;&#x7684;&#x65B9;&#x6CD5;&#x3002;&#x5B83;&#x53EF;&#x4EE5;&#x88AB;<code>Object</code>&#x5B9E;&#x4F8B;&#x76F4;&#x63A5;&#x4F7F;&#x7528;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-built_in">Object</span>.prototype.print = <span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) </span>{
  <span class="hljs-built_in">console</span>.log(<span class="hljs-keyword">this</span>);
};

<span class="hljs-keyword">var</span> obj = <span class="hljs-keyword">new</span> <span class="hljs-built_in">Object</span>();
obj.print() <span class="hljs-comment">// Object</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;<code>Object.prototype</code>&#x5B9A;&#x4E49;&#x4E86;&#x4E00;&#x4E2A;<code>print</code>&#x65B9;&#x6CD5;&#xFF0C;&#x7136;&#x540E;&#x751F;&#x6210;&#x4E00;&#x4E2A;<code>Object</code>&#x7684;&#x5B9E;&#x4F8B;<code>obj</code>&#x3002;<code>obj</code>&#x76F4;&#x63A5;&#x7EE7;&#x627F;&#x4E86;<code>Object.prototype</code>&#x7684;&#x5C5E;&#x6027;&#x548C;&#x65B9;&#x6CD5;&#xFF0C;&#x53EF;&#x4EE5;&#x76F4;&#x63A5;&#x4F7F;&#x7528;<code>obj.print</code>&#x8C03;&#x7528;<code>print</code>&#x65B9;&#x6CD5;&#x3002;&#x4E5F;&#x5C31;&#x662F;&#x8BF4;&#xFF0C;<code>obj</code>&#x5BF9;&#x8C61;&#x7684;<code>print</code>&#x65B9;&#x6CD5;&#x5B9E;&#x8D28;&#x4E0A;&#x5C31;&#x662F;&#x8C03;&#x7528;<code>Object.prototype.print</code>&#x65B9;&#x6CD5;&#x3002;</p>
<p>&#x5173;&#x4E8E;&#x539F;&#x578B;&#x5BF9;&#x8C61;<code>object.prototype</code>&#x7684;&#x8BE6;&#x7EC6;&#x89E3;&#x91CA;&#xFF0C;&#x53C2;&#x89C1;&#x300A;&#x9762;&#x5411;&#x5BF9;&#x8C61;&#x7F16;&#x7A0B;&#x300B;&#x7AE0;&#x8282;&#x3002;&#x8FD9;&#x91CC;&#x53EA;&#x8981;&#x77E5;&#x9053;&#xFF0C;&#x51E1;&#x662F;&#x5B9A;&#x4E49;&#x5728;<code>Object.prototype</code>&#x5BF9;&#x8C61;&#x4E0A;&#x9762;&#x7684;&#x5C5E;&#x6027;&#x548C;&#x65B9;&#x6CD5;&#xFF0C;&#x5C06;&#x88AB;&#x6240;&#x6709;&#x5B9E;&#x4F8B;&#x5BF9;&#x8C61;&#x5171;&#x4EAB;&#x5C31;&#x53EF;&#x4EE5;&#x4E86;&#x3002;</p>
<p>&#x4EE5;&#x4E0B;&#x5148;&#x4ECB;&#x7ECD;<code>Object</code>&#x4F5C;&#x4E3A;&#x51FD;&#x6570;&#x7684;&#x7528;&#x6CD5;&#xFF0C;&#x7136;&#x540E;&#x518D;&#x4ECB;&#x7ECD;<code>Object</code>&#x5BF9;&#x8C61;&#x7684;&#x539F;&#x751F;&#x65B9;&#x6CD5;&#xFF0C;&#x5206;&#x6210;&#x5BF9;&#x8C61;&#x81EA;&#x8EAB;&#x7684;&#x65B9;&#x6CD5;&#xFF08;&#x53C8;&#x79F0;&#x4E3A;&#x201C;&#x9759;&#x6001;&#x65B9;&#x6CD5;&#x201D;&#xFF09;&#x548C;&#x5B9E;&#x4F8B;&#x65B9;&#x6CD5;&#x4E24;&#x90E8;&#x5206;&#x3002;</p>
<h2 id="object">Object()</h2>
<p><code>Object</code>&#x672C;&#x8EAB;&#x662F;&#x4E00;&#x4E2A;&#x51FD;&#x6570;&#xFF0C;&#x53EF;&#x4EE5;&#x5F53;&#x4F5C;&#x5DE5;&#x5177;&#x65B9;&#x6CD5;&#x4F7F;&#x7528;&#xFF0C;&#x5C06;&#x4EFB;&#x610F;&#x503C;&#x8F6C;&#x4E3A;&#x5BF9;&#x8C61;&#x3002;&#x8FD9;&#x4E2A;&#x65B9;&#x6CD5;&#x5E38;&#x7528;&#x4E8E;&#x4FDD;&#x8BC1;&#x67D0;&#x4E2A;&#x503C;&#x4E00;&#x5B9A;&#x662F;&#x5BF9;&#x8C61;&#x3002;</p>
<p>&#x5982;&#x679C;&#x53C2;&#x6570;&#x4E3A;&#x7A7A;&#xFF08;&#x6216;&#x8005;&#x4E3A;<code>undefined</code>&#x548C;<code>null</code>&#xFF09;&#xFF0C;<code>Object()</code>&#x8FD4;&#x56DE;&#x4E00;&#x4E2A;&#x7A7A;&#x5BF9;&#x8C61;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> obj = <span class="hljs-built_in">Object</span>();
<span class="hljs-comment">// &#x7B49;&#x540C;&#x4E8E;</span>
<span class="hljs-keyword">var</span> obj = <span class="hljs-built_in">Object</span>(<span class="hljs-literal">undefined</span>);
<span class="hljs-keyword">var</span> obj = <span class="hljs-built_in">Object</span>(<span class="hljs-literal">null</span>);

obj <span class="hljs-keyword">instanceof</span> <span class="hljs-built_in">Object</span> <span class="hljs-comment">// true</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x7684;&#x542B;&#x4E49;&#xFF0C;&#x662F;&#x5C06;<code>undefined</code>&#x548C;<code>null</code>&#x8F6C;&#x4E3A;&#x5BF9;&#x8C61;&#xFF0C;&#x7ED3;&#x679C;&#x5F97;&#x5230;&#x4E86;&#x4E00;&#x4E2A;&#x7A7A;&#x5BF9;&#x8C61;<code>obj</code>&#x3002;</p>
<p><code>instanceof</code>&#x8FD0;&#x7B97;&#x7B26;&#x7528;&#x6765;&#x9A8C;&#x8BC1;&#xFF0C;&#x4E00;&#x4E2A;&#x5BF9;&#x8C61;&#x662F;&#x5426;&#x4E3A;&#x6307;&#x5B9A;&#x7684;&#x6784;&#x9020;&#x51FD;&#x6570;&#x7684;&#x5B9E;&#x4F8B;&#x3002;<code>obj instanceof Object</code>&#x8FD4;&#x56DE;<code>true</code>&#xFF0C;&#x5C31;&#x8868;&#x793A;<code>obj</code>&#x5BF9;&#x8C61;&#x662F;<code>Object</code>&#x7684;&#x5B9E;&#x4F8B;&#x3002;</p>
<p>&#x5982;&#x679C;&#x53C2;&#x6570;&#x662F;&#x539F;&#x59CB;&#x7C7B;&#x578B;&#x7684;&#x503C;&#xFF0C;<code>Object</code>&#x65B9;&#x6CD5;&#x5C06;&#x5176;&#x8F6C;&#x4E3A;&#x5BF9;&#x5E94;&#x7684;&#x5305;&#x88C5;&#x5BF9;&#x8C61;&#x7684;&#x5B9E;&#x4F8B;&#xFF08;&#x53C2;&#x89C1;&#x300A;&#x539F;&#x59CB;&#x7C7B;&#x578B;&#x7684;&#x5305;&#x88C5;&#x5BF9;&#x8C61;&#x300B;&#x4E00;&#x7AE0;&#xFF09;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> obj = <span class="hljs-built_in">Object</span>(<span class="hljs-number">1</span>);
obj <span class="hljs-keyword">instanceof</span> <span class="hljs-built_in">Object</span> <span class="hljs-comment">// true</span>
obj <span class="hljs-keyword">instanceof</span> <span class="hljs-built_in">Number</span> <span class="hljs-comment">// true</span>

<span class="hljs-keyword">var</span> obj = <span class="hljs-built_in">Object</span>(<span class="hljs-string">&apos;foo&apos;</span>);
obj <span class="hljs-keyword">instanceof</span> <span class="hljs-built_in">Object</span> <span class="hljs-comment">// true</span>
obj <span class="hljs-keyword">instanceof</span> <span class="hljs-built_in">String</span> <span class="hljs-comment">// true</span>

<span class="hljs-keyword">var</span> obj = <span class="hljs-built_in">Object</span>(<span class="hljs-literal">true</span>);
obj <span class="hljs-keyword">instanceof</span> <span class="hljs-built_in">Object</span> <span class="hljs-comment">// true</span>
obj <span class="hljs-keyword">instanceof</span> <span class="hljs-built_in">Boolean</span> <span class="hljs-comment">// true</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;<code>Object</code>&#x51FD;&#x6570;&#x7684;&#x53C2;&#x6570;&#x662F;&#x5404;&#x79CD;&#x539F;&#x59CB;&#x7C7B;&#x578B;&#x7684;&#x503C;&#xFF0C;&#x8F6C;&#x6362;&#x6210;&#x5BF9;&#x8C61;&#x5C31;&#x662F;&#x539F;&#x59CB;&#x7C7B;&#x578B;&#x503C;&#x5BF9;&#x5E94;&#x7684;&#x5305;&#x88C5;&#x5BF9;&#x8C61;&#x3002;</p>
<p>&#x5982;&#x679C;<code>Object</code>&#x65B9;&#x6CD5;&#x7684;&#x53C2;&#x6570;&#x662F;&#x4E00;&#x4E2A;&#x5BF9;&#x8C61;&#xFF0C;&#x5B83;&#x603B;&#x662F;&#x8FD4;&#x56DE;&#x8BE5;&#x5BF9;&#x8C61;&#xFF0C;&#x5373;&#x4E0D;&#x7528;&#x8F6C;&#x6362;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> arr = [];
<span class="hljs-keyword">var</span> obj = <span class="hljs-built_in">Object</span>(arr); <span class="hljs-comment">// &#x8FD4;&#x56DE;&#x539F;&#x6570;&#x7EC4;</span>
obj === arr <span class="hljs-comment">// true</span>

<span class="hljs-keyword">var</span> value = {};
<span class="hljs-keyword">var</span> obj = <span class="hljs-built_in">Object</span>(value) <span class="hljs-comment">// &#x8FD4;&#x56DE;&#x539F;&#x5BF9;&#x8C61;</span>
obj === value <span class="hljs-comment">// true</span>

<span class="hljs-keyword">var</span> fn = <span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) </span>{};
<span class="hljs-keyword">var</span> obj = <span class="hljs-built_in">Object</span>(fn); <span class="hljs-comment">// &#x8FD4;&#x56DE;&#x539F;&#x51FD;&#x6570;</span>
obj === fn <span class="hljs-comment">// true</span>
</code></pre>
<p>&#x5229;&#x7528;&#x8FD9;&#x4E00;&#x70B9;&#xFF0C;&#x53EF;&#x4EE5;&#x5199;&#x4E00;&#x4E2A;&#x5224;&#x65AD;&#x53D8;&#x91CF;&#x662F;&#x5426;&#x4E3A;&#x5BF9;&#x8C61;&#x7684;&#x51FD;&#x6570;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">isObject</span>(<span class="hljs-params">value</span>) </span>{
  <span class="hljs-keyword">return</span> value === <span class="hljs-built_in">Object</span>(value);
}

isObject([]) <span class="hljs-comment">// true</span>
isObject(<span class="hljs-literal">true</span>) <span class="hljs-comment">// false</span>
</code></pre>
<h2 id="object-&#x6784;&#x9020;&#x51FD;&#x6570;">Object &#x6784;&#x9020;&#x51FD;&#x6570;</h2>
<p><code>Object</code>&#x4E0D;&#x4EC5;&#x53EF;&#x4EE5;&#x5F53;&#x4F5C;&#x5DE5;&#x5177;&#x51FD;&#x6570;&#x4F7F;&#x7528;&#xFF0C;&#x8FD8;&#x53EF;&#x4EE5;&#x5F53;&#x4F5C;&#x6784;&#x9020;&#x51FD;&#x6570;&#x4F7F;&#x7528;&#xFF0C;&#x5373;&#x524D;&#x9762;&#x53EF;&#x4EE5;&#x4F7F;&#x7528;<code>new</code>&#x547D;&#x4EE4;&#x3002;</p>
<p><code>Object</code>&#x6784;&#x9020;&#x51FD;&#x6570;&#x7684;&#x9996;&#x8981;&#x7528;&#x9014;&#xFF0C;&#x662F;&#x76F4;&#x63A5;&#x901A;&#x8FC7;&#x5B83;&#x6765;&#x751F;&#x6210;&#x65B0;&#x5BF9;&#x8C61;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> obj = <span class="hljs-keyword">new</span> <span class="hljs-built_in">Object</span>();
</code></pre>
<blockquote>
<p>&#x6CE8;&#x610F;&#xFF0C;&#x901A;&#x8FC7;<code>var obj = new Object()</code>&#x7684;&#x5199;&#x6CD5;&#x751F;&#x6210;&#x65B0;&#x5BF9;&#x8C61;&#xFF0C;&#x4E0E;&#x5B57;&#x9762;&#x91CF;&#x7684;&#x5199;&#x6CD5;<code>var obj = {}</code>&#x662F;&#x7B49;&#x4EF7;&#x7684;&#x3002;&#x6216;&#x8005;&#x8BF4;&#xFF0C;&#x540E;&#x8005;&#x53EA;&#x662F;&#x524D;&#x8005;&#x7684;&#x4E00;&#x79CD;&#x7B80;&#x4FBF;&#x5199;&#x6CD5;&#x3002;</p>
</blockquote>
<p><code>Object</code>&#x6784;&#x9020;&#x51FD;&#x6570;&#x7684;&#x7528;&#x6CD5;&#x4E0E;&#x5DE5;&#x5177;&#x65B9;&#x6CD5;&#x5F88;&#x76F8;&#x4F3C;&#xFF0C;&#x51E0;&#x4E4E;&#x4E00;&#x6A21;&#x4E00;&#x6837;&#x3002;&#x4F7F;&#x7528;&#x65F6;&#xFF0C;&#x53EF;&#x4EE5;&#x63A5;&#x53D7;&#x4E00;&#x4E2A;&#x53C2;&#x6570;&#xFF0C;&#x5982;&#x679C;&#x8BE5;&#x53C2;&#x6570;&#x662F;&#x4E00;&#x4E2A;&#x5BF9;&#x8C61;&#xFF0C;&#x5219;&#x76F4;&#x63A5;&#x8FD4;&#x56DE;&#x8FD9;&#x4E2A;&#x5BF9;&#x8C61;&#xFF1B;&#x5982;&#x679C;&#x662F;&#x4E00;&#x4E2A;&#x539F;&#x59CB;&#x7C7B;&#x578B;&#x7684;&#x503C;&#xFF0C;&#x5219;&#x8FD4;&#x56DE;&#x8BE5;&#x503C;&#x5BF9;&#x5E94;&#x7684;&#x5305;&#x88C5;&#x5BF9;&#x8C61;&#xFF08;&#x8BE6;&#x89C1;&#x300A;&#x5305;&#x88C5;&#x5BF9;&#x8C61;&#x300B;&#x4E00;&#x7AE0;&#xFF09;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> o1 = {a: <span class="hljs-number">1</span>};
<span class="hljs-keyword">var</span> o2 = <span class="hljs-keyword">new</span> <span class="hljs-built_in">Object</span>(o1);
o1 === o2 <span class="hljs-comment">// true</span>

<span class="hljs-keyword">var</span> obj = <span class="hljs-keyword">new</span> <span class="hljs-built_in">Object</span>(<span class="hljs-number">123</span>);
obj <span class="hljs-keyword">instanceof</span> <span class="hljs-built_in">Number</span> <span class="hljs-comment">// true</span>
</code></pre>
<p>&#x867D;&#x7136;&#x7528;&#x6CD5;&#x76F8;&#x4F3C;&#xFF0C;&#x4F46;&#x662F;<code>Object(value)</code>&#x4E0E;<code>new Object(value)</code>&#x4E24;&#x8005;&#x7684;&#x8BED;&#x4E49;&#x662F;&#x4E0D;&#x540C;&#x7684;&#xFF0C;<code>Object(value)</code>&#x8868;&#x793A;&#x5C06;<code>value</code>&#x8F6C;&#x6210;&#x4E00;&#x4E2A;&#x5BF9;&#x8C61;&#xFF0C;<code>new Object(value)</code>&#x5219;&#x8868;&#x793A;&#x65B0;&#x751F;&#x6210;&#x4E00;&#x4E2A;&#x5BF9;&#x8C61;&#xFF0C;&#x5B83;&#x7684;&#x503C;&#x662F;<code>value</code>&#x3002;</p>
<h2 id="object-&#x7684;&#x9759;&#x6001;&#x65B9;&#x6CD5;">Object &#x7684;&#x9759;&#x6001;&#x65B9;&#x6CD5;</h2>
<p>&#x6240;&#x8C13;&#x201C;&#x9759;&#x6001;&#x65B9;&#x6CD5;&#x201D;&#xFF0C;&#x662F;&#x6307;&#x90E8;&#x7F72;&#x5728;<code>Object</code>&#x5BF9;&#x8C61;&#x81EA;&#x8EAB;&#x7684;&#x65B9;&#x6CD5;&#x3002;</p>
<h3 id="objectkeys&#xFF0C;objectgetownpropertynames">Object.keys()&#xFF0C;Object.getOwnPropertyNames()</h3>
<p><code>Object.keys</code>&#x65B9;&#x6CD5;&#x548C;<code>Object.getOwnPropertyNames</code>&#x65B9;&#x6CD5;&#x90FD;&#x7528;&#x6765;&#x904D;&#x5386;&#x5BF9;&#x8C61;&#x7684;&#x5C5E;&#x6027;&#x3002;</p>
<p><code>Object.keys</code>&#x65B9;&#x6CD5;&#x7684;&#x53C2;&#x6570;&#x662F;&#x4E00;&#x4E2A;&#x5BF9;&#x8C61;&#xFF0C;&#x8FD4;&#x56DE;&#x4E00;&#x4E2A;&#x6570;&#x7EC4;&#x3002;&#x8BE5;&#x6570;&#x7EC4;&#x7684;&#x6210;&#x5458;&#x90FD;&#x662F;&#x8BE5;&#x5BF9;&#x8C61;&#x81EA;&#x8EAB;&#x7684;&#xFF08;&#x800C;&#x4E0D;&#x662F;&#x7EE7;&#x627F;&#x7684;&#xFF09;&#x6240;&#x6709;&#x5C5E;&#x6027;&#x540D;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> obj = {
  p1: <span class="hljs-number">123</span>,
  p2: <span class="hljs-number">456</span>
};

<span class="hljs-built_in">Object</span>.keys(obj) <span class="hljs-comment">// [&quot;p1&quot;, &quot;p2&quot;]</span>
</code></pre>
<p><code>Object.getOwnPropertyNames</code>&#x65B9;&#x6CD5;&#x4E0E;<code>Object.keys</code>&#x7C7B;&#x4F3C;&#xFF0C;&#x4E5F;&#x662F;&#x63A5;&#x53D7;&#x4E00;&#x4E2A;&#x5BF9;&#x8C61;&#x4F5C;&#x4E3A;&#x53C2;&#x6570;&#xFF0C;&#x8FD4;&#x56DE;&#x4E00;&#x4E2A;&#x6570;&#x7EC4;&#xFF0C;&#x5305;&#x542B;&#x4E86;&#x8BE5;&#x5BF9;&#x8C61;&#x81EA;&#x8EAB;&#x7684;&#x6240;&#x6709;&#x5C5E;&#x6027;&#x540D;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> obj = {
  p1: <span class="hljs-number">123</span>,
  p2: <span class="hljs-number">456</span>
};

<span class="hljs-built_in">Object</span>.getOwnPropertyNames(obj) <span class="hljs-comment">// [&quot;p1&quot;, &quot;p2&quot;]</span>
</code></pre>
<p>&#x5BF9;&#x4E8E;&#x4E00;&#x822C;&#x7684;&#x5BF9;&#x8C61;&#x6765;&#x8BF4;&#xFF0C;<code>Object.keys()</code>&#x548C;<code>Object.getOwnPropertyNames()</code>&#x8FD4;&#x56DE;&#x7684;&#x7ED3;&#x679C;&#x662F;&#x4E00;&#x6837;&#x7684;&#x3002;&#x53EA;&#x6709;&#x6D89;&#x53CA;&#x4E0D;&#x53EF;&#x679A;&#x4E3E;&#x5C5E;&#x6027;&#x65F6;&#xFF0C;&#x624D;&#x4F1A;&#x6709;&#x4E0D;&#x4E00;&#x6837;&#x7684;&#x7ED3;&#x679C;&#x3002;<code>Object.keys</code>&#x65B9;&#x6CD5;&#x53EA;&#x8FD4;&#x56DE;&#x53EF;&#x679A;&#x4E3E;&#x7684;&#x5C5E;&#x6027;&#xFF08;&#x8BE6;&#x89C1;&#x300A;&#x5BF9;&#x8C61;&#x5C5E;&#x6027;&#x7684;&#x63CF;&#x8FF0;&#x5BF9;&#x8C61;&#x300B;&#x4E00;&#x7AE0;&#xFF09;&#xFF0C;<code>Object.getOwnPropertyNames</code>&#x65B9;&#x6CD5;&#x8FD8;&#x8FD4;&#x56DE;&#x4E0D;&#x53EF;&#x679A;&#x4E3E;&#x7684;&#x5C5E;&#x6027;&#x540D;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> a = [<span class="hljs-string">&apos;Hello&apos;</span>, <span class="hljs-string">&apos;World&apos;</span>];

<span class="hljs-built_in">Object</span>.keys(a) <span class="hljs-comment">// [&quot;0&quot;, &quot;1&quot;]</span>
<span class="hljs-built_in">Object</span>.getOwnPropertyNames(a) <span class="hljs-comment">// [&quot;0&quot;, &quot;1&quot;, &quot;length&quot;]</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;&#x6570;&#x7EC4;&#x7684;<code>length</code>&#x5C5E;&#x6027;&#x662F;&#x4E0D;&#x53EF;&#x679A;&#x4E3E;&#x7684;&#x5C5E;&#x6027;&#xFF0C;&#x6240;&#x4EE5;&#x53EA;&#x51FA;&#x73B0;&#x5728;<code>Object.getOwnPropertyNames</code>&#x65B9;&#x6CD5;&#x7684;&#x8FD4;&#x56DE;&#x7ED3;&#x679C;&#x4E2D;&#x3002;</p>
<p>&#x7531;&#x4E8E; JavaScript &#x6CA1;&#x6709;&#x63D0;&#x4F9B;&#x8BA1;&#x7B97;&#x5BF9;&#x8C61;&#x5C5E;&#x6027;&#x4E2A;&#x6570;&#x7684;&#x65B9;&#x6CD5;&#xFF0C;&#x6240;&#x4EE5;&#x53EF;&#x4EE5;&#x7528;&#x8FD9;&#x4E24;&#x4E2A;&#x65B9;&#x6CD5;&#x4EE3;&#x66FF;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> obj = {
  p1: <span class="hljs-number">123</span>,
  p2: <span class="hljs-number">456</span>
};

<span class="hljs-built_in">Object</span>.keys(obj).length <span class="hljs-comment">// 2</span>
<span class="hljs-built_in">Object</span>.getOwnPropertyNames(obj).length <span class="hljs-comment">// 2</span>
</code></pre>
<p>&#x4E00;&#x822C;&#x60C5;&#x51B5;&#x4E0B;&#xFF0C;&#x51E0;&#x4E4E;&#x603B;&#x662F;&#x4F7F;&#x7528;<code>Object.keys</code>&#x65B9;&#x6CD5;&#xFF0C;&#x904D;&#x5386;&#x5BF9;&#x8C61;&#x7684;&#x5C5E;&#x6027;&#x3002;</p>
<h3 id="&#x5176;&#x4ED6;&#x65B9;&#x6CD5;">&#x5176;&#x4ED6;&#x65B9;&#x6CD5;</h3>
<p>&#x9664;&#x4E86;&#x4E0A;&#x9762;&#x63D0;&#x5230;&#x7684;&#x4E24;&#x4E2A;&#x65B9;&#x6CD5;&#xFF0C;<code>Object</code>&#x8FD8;&#x6709;&#x4E0D;&#x5C11;&#x5176;&#x4ED6;&#x9759;&#x6001;&#x65B9;&#x6CD5;&#xFF0C;&#x5C06;&#x5728;&#x540E;&#x6587;&#x9010;&#x4E00;&#x8BE6;&#x7EC6;&#x4ECB;&#x7ECD;&#x3002;</p>
<p><strong>&#xFF08;1&#xFF09;&#x5BF9;&#x8C61;&#x5C5E;&#x6027;&#x6A21;&#x578B;&#x7684;&#x76F8;&#x5173;&#x65B9;&#x6CD5;</strong></p>
<ul>
<li><code>Object.getOwnPropertyDescriptor()</code>&#xFF1A;&#x83B7;&#x53D6;&#x67D0;&#x4E2A;&#x5C5E;&#x6027;&#x7684;&#x63CF;&#x8FF0;&#x5BF9;&#x8C61;&#x3002;</li>
<li><code>Object.defineProperty()</code>&#xFF1A;&#x901A;&#x8FC7;&#x63CF;&#x8FF0;&#x5BF9;&#x8C61;&#xFF0C;&#x5B9A;&#x4E49;&#x67D0;&#x4E2A;&#x5C5E;&#x6027;&#x3002;</li>
<li><code>Object.defineProperties()</code>&#xFF1A;&#x901A;&#x8FC7;&#x63CF;&#x8FF0;&#x5BF9;&#x8C61;&#xFF0C;&#x5B9A;&#x4E49;&#x591A;&#x4E2A;&#x5C5E;&#x6027;&#x3002;</li>
</ul>
<p><strong>&#xFF08;2&#xFF09;&#x63A7;&#x5236;&#x5BF9;&#x8C61;&#x72B6;&#x6001;&#x7684;&#x65B9;&#x6CD5;</strong></p>
<ul>
<li><code>Object.preventExtensions()</code>&#xFF1A;&#x9632;&#x6B62;&#x5BF9;&#x8C61;&#x6269;&#x5C55;&#x3002;</li>
<li><code>Object.isExtensible()</code>&#xFF1A;&#x5224;&#x65AD;&#x5BF9;&#x8C61;&#x662F;&#x5426;&#x53EF;&#x6269;&#x5C55;&#x3002;</li>
<li><code>Object.seal()</code>&#xFF1A;&#x7981;&#x6B62;&#x5BF9;&#x8C61;&#x914D;&#x7F6E;&#x3002;</li>
<li><code>Object.isSealed()</code>&#xFF1A;&#x5224;&#x65AD;&#x4E00;&#x4E2A;&#x5BF9;&#x8C61;&#x662F;&#x5426;&#x53EF;&#x914D;&#x7F6E;&#x3002;</li>
<li><code>Object.freeze()</code>&#xFF1A;&#x51BB;&#x7ED3;&#x4E00;&#x4E2A;&#x5BF9;&#x8C61;&#x3002;</li>
<li><code>Object.isFrozen()</code>&#xFF1A;&#x5224;&#x65AD;&#x4E00;&#x4E2A;&#x5BF9;&#x8C61;&#x662F;&#x5426;&#x88AB;&#x51BB;&#x7ED3;&#x3002;</li>
</ul>
<p><strong>&#xFF08;3&#xFF09;&#x539F;&#x578B;&#x94FE;&#x76F8;&#x5173;&#x65B9;&#x6CD5;</strong></p>
<ul>
<li><code>Object.create()</code>&#xFF1A;&#x8BE5;&#x65B9;&#x6CD5;&#x53EF;&#x4EE5;&#x6307;&#x5B9A;&#x539F;&#x578B;&#x5BF9;&#x8C61;&#x548C;&#x5C5E;&#x6027;&#xFF0C;&#x8FD4;&#x56DE;&#x4E00;&#x4E2A;&#x65B0;&#x7684;&#x5BF9;&#x8C61;&#x3002;</li>
<li><code>Object.getPrototypeOf()</code>&#xFF1A;&#x83B7;&#x53D6;&#x5BF9;&#x8C61;&#x7684;<code>Prototype</code>&#x5BF9;&#x8C61;&#x3002;</li>
</ul>
<h2 id="object-&#x7684;&#x5B9E;&#x4F8B;&#x65B9;&#x6CD5;">Object &#x7684;&#x5B9E;&#x4F8B;&#x65B9;&#x6CD5;</h2>
<p>&#x9664;&#x4E86;&#x9759;&#x6001;&#x65B9;&#x6CD5;&#xFF0C;&#x8FD8;&#x6709;&#x4E0D;&#x5C11;&#x65B9;&#x6CD5;&#x5B9A;&#x4E49;&#x5728;<code>Object.prototype</code>&#x5BF9;&#x8C61;&#x3002;&#x5B83;&#x4EEC;&#x79F0;&#x4E3A;&#x5B9E;&#x4F8B;&#x65B9;&#x6CD5;&#xFF0C;&#x6240;&#x6709;<code>Object</code>&#x7684;&#x5B9E;&#x4F8B;&#x5BF9;&#x8C61;&#x90FD;&#x7EE7;&#x627F;&#x4E86;&#x8FD9;&#x4E9B;&#x65B9;&#x6CD5;&#x3002;</p>
<p><code>Object</code>&#x5B9E;&#x4F8B;&#x5BF9;&#x8C61;&#x7684;&#x65B9;&#x6CD5;&#xFF0C;&#x4E3B;&#x8981;&#x6709;&#x4EE5;&#x4E0B;&#x516D;&#x4E2A;&#x3002;</p>
<ul>
<li><code>Object.prototype.valueOf()</code>&#xFF1A;&#x8FD4;&#x56DE;&#x5F53;&#x524D;&#x5BF9;&#x8C61;&#x5BF9;&#x5E94;&#x7684;&#x503C;&#x3002;</li>
<li><code>Object.prototype.toString()</code>&#xFF1A;&#x8FD4;&#x56DE;&#x5F53;&#x524D;&#x5BF9;&#x8C61;&#x5BF9;&#x5E94;&#x7684;&#x5B57;&#x7B26;&#x4E32;&#x5F62;&#x5F0F;&#x3002;</li>
<li><code>Object.prototype.toLocaleString()</code>&#xFF1A;&#x8FD4;&#x56DE;&#x5F53;&#x524D;&#x5BF9;&#x8C61;&#x5BF9;&#x5E94;&#x7684;&#x672C;&#x5730;&#x5B57;&#x7B26;&#x4E32;&#x5F62;&#x5F0F;&#x3002;</li>
<li><code>Object.prototype.hasOwnProperty()</code>&#xFF1A;&#x5224;&#x65AD;&#x67D0;&#x4E2A;&#x5C5E;&#x6027;&#x662F;&#x5426;&#x4E3A;&#x5F53;&#x524D;&#x5BF9;&#x8C61;&#x81EA;&#x8EAB;&#x7684;&#x5C5E;&#x6027;&#xFF0C;&#x8FD8;&#x662F;&#x7EE7;&#x627F;&#x81EA;&#x539F;&#x578B;&#x5BF9;&#x8C61;&#x7684;&#x5C5E;&#x6027;&#x3002;</li>
<li><code>Object.prototype.isPrototypeOf()</code>&#xFF1A;&#x5224;&#x65AD;&#x5F53;&#x524D;&#x5BF9;&#x8C61;&#x662F;&#x5426;&#x4E3A;&#x53E6;&#x4E00;&#x4E2A;&#x5BF9;&#x8C61;&#x7684;&#x539F;&#x578B;&#x3002;</li>
<li><code>Object.prototype.propertyIsEnumerable()</code>&#xFF1A;&#x5224;&#x65AD;&#x67D0;&#x4E2A;&#x5C5E;&#x6027;&#x662F;&#x5426;&#x53EF;&#x679A;&#x4E3E;&#x3002;</li>
</ul>
<p>&#x672C;&#x8282;&#x4ECB;&#x7ECD;&#x524D;&#x56DB;&#x4E2A;&#x65B9;&#x6CD5;&#xFF0C;&#x53E6;&#x5916;&#x4E24;&#x4E2A;&#x65B9;&#x6CD5;&#x5C06;&#x5728;&#x540E;&#x6587;&#x76F8;&#x5173;&#x7AE0;&#x8282;&#x4ECB;&#x7ECD;&#x3002;</p>
<h3 id="objectprototypevalueof">Object.prototype.valueOf()</h3>
<p><code>valueOf</code>&#x65B9;&#x6CD5;&#x7684;&#x4F5C;&#x7528;&#x662F;&#x8FD4;&#x56DE;&#x4E00;&#x4E2A;&#x5BF9;&#x8C61;&#x7684;&#x201C;&#x503C;&#x201D;&#xFF0C;&#x9ED8;&#x8BA4;&#x60C5;&#x51B5;&#x4E0B;&#x8FD4;&#x56DE;&#x5BF9;&#x8C61;&#x672C;&#x8EAB;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> obj = <span class="hljs-keyword">new</span> <span class="hljs-built_in">Object</span>();
obj.valueOf() === obj <span class="hljs-comment">// true</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x6BD4;&#x8F83;<code>obj.valueOf()</code>&#x4E0E;<code>obj</code>&#x672C;&#x8EAB;&#xFF0C;&#x4E24;&#x8005;&#x662F;&#x4E00;&#x6837;&#x7684;&#x3002;</p>
<p><code>valueOf</code>&#x65B9;&#x6CD5;&#x7684;&#x4E3B;&#x8981;&#x7528;&#x9014;&#x662F;&#xFF0C;JavaScript &#x81EA;&#x52A8;&#x7C7B;&#x578B;&#x8F6C;&#x6362;&#x65F6;&#x4F1A;&#x9ED8;&#x8BA4;&#x8C03;&#x7528;&#x8FD9;&#x4E2A;&#x65B9;&#x6CD5;&#xFF08;&#x8BE6;&#x89C1;&#x300A;&#x6570;&#x636E;&#x7C7B;&#x578B;&#x8F6C;&#x6362;&#x300B;&#x4E00;&#x7AE0;&#xFF09;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> obj = <span class="hljs-keyword">new</span> <span class="hljs-built_in">Object</span>();
<span class="hljs-number">1</span> + obj <span class="hljs-comment">// &quot;1[object Object]&quot;</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x5C06;&#x5BF9;&#x8C61;<code>obj</code>&#x4E0E;&#x6570;&#x5B57;<code>1</code>&#x76F8;&#x52A0;&#xFF0C;&#x8FD9;&#x65F6; JavaScript &#x5C31;&#x4F1A;&#x9ED8;&#x8BA4;&#x8C03;&#x7528;<code>valueOf()</code>&#x65B9;&#x6CD5;&#xFF0C;&#x6C42;&#x51FA;<code>obj</code>&#x7684;&#x503C;&#x518D;&#x4E0E;<code>1</code>&#x76F8;&#x52A0;&#x3002;&#x6240;&#x4EE5;&#xFF0C;&#x5982;&#x679C;&#x81EA;&#x5B9A;&#x4E49;<code>valueOf</code>&#x65B9;&#x6CD5;&#xFF0C;&#x5C31;&#x53EF;&#x4EE5;&#x5F97;&#x5230;&#x60F3;&#x8981;&#x7684;&#x7ED3;&#x679C;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> obj = <span class="hljs-keyword">new</span> <span class="hljs-built_in">Object</span>();
obj.valueOf = <span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) </span>{
  <span class="hljs-keyword">return</span> <span class="hljs-number">2</span>;
};

<span class="hljs-number">1</span> + obj <span class="hljs-comment">// 3</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x81EA;&#x5B9A;&#x4E49;&#x4E86;<code>obj</code>&#x5BF9;&#x8C61;&#x7684;<code>valueOf</code>&#x65B9;&#x6CD5;&#xFF0C;&#x4E8E;&#x662F;<code>1 + obj</code>&#x5C31;&#x5F97;&#x5230;&#x4E86;<code>3</code>&#x3002;&#x8FD9;&#x79CD;&#x65B9;&#x6CD5;&#x5C31;&#x76F8;&#x5F53;&#x4E8E;&#x7528;&#x81EA;&#x5B9A;&#x4E49;&#x7684;<code>obj.valueOf</code>&#xFF0C;&#x8986;&#x76D6;<code>Object.prototype.valueOf</code>&#x3002;</p>
<h3 id="objectprototypetostring">Object.prototype.toString()</h3>
<p><code>toString</code>&#x65B9;&#x6CD5;&#x7684;&#x4F5C;&#x7528;&#x662F;&#x8FD4;&#x56DE;&#x4E00;&#x4E2A;&#x5BF9;&#x8C61;&#x7684;&#x5B57;&#x7B26;&#x4E32;&#x5F62;&#x5F0F;&#xFF0C;&#x9ED8;&#x8BA4;&#x60C5;&#x51B5;&#x4E0B;&#x8FD4;&#x56DE;&#x7C7B;&#x578B;&#x5B57;&#x7B26;&#x4E32;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> o1 = <span class="hljs-keyword">new</span> <span class="hljs-built_in">Object</span>();
o1.toString() <span class="hljs-comment">// &quot;[object Object]&quot;</span>

<span class="hljs-keyword">var</span> o2 = {a:<span class="hljs-number">1</span>};
o2.toString() <span class="hljs-comment">// &quot;[object Object]&quot;</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x8868;&#x793A;&#xFF0C;&#x5BF9;&#x4E8E;&#x4E00;&#x4E2A;&#x5BF9;&#x8C61;&#x8C03;&#x7528;<code>toString</code>&#x65B9;&#x6CD5;&#xFF0C;&#x4F1A;&#x8FD4;&#x56DE;&#x5B57;&#x7B26;&#x4E32;<code>[object Object]</code>&#xFF0C;&#x8BE5;&#x5B57;&#x7B26;&#x4E32;&#x8BF4;&#x660E;&#x5BF9;&#x8C61;&#x7684;&#x7C7B;&#x578B;&#x3002;</p>
<p>&#x5B57;&#x7B26;&#x4E32;<code>[object Object]</code>&#x672C;&#x8EAB;&#x6CA1;&#x6709;&#x592A;&#x5927;&#x7684;&#x7528;&#x5904;&#xFF0C;&#x4F46;&#x662F;&#x901A;&#x8FC7;&#x81EA;&#x5B9A;&#x4E49;<code>toString</code>&#x65B9;&#x6CD5;&#xFF0C;&#x53EF;&#x4EE5;&#x8BA9;&#x5BF9;&#x8C61;&#x5728;&#x81EA;&#x52A8;&#x7C7B;&#x578B;&#x8F6C;&#x6362;&#x65F6;&#xFF0C;&#x5F97;&#x5230;&#x60F3;&#x8981;&#x7684;&#x5B57;&#x7B26;&#x4E32;&#x5F62;&#x5F0F;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> obj = <span class="hljs-keyword">new</span> <span class="hljs-built_in">Object</span>();

obj.toString = <span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) </span>{
  <span class="hljs-keyword">return</span> <span class="hljs-string">&apos;hello&apos;</span>;
};

obj + <span class="hljs-string">&apos; &apos;</span> + <span class="hljs-string">&apos;world&apos;</span> <span class="hljs-comment">// &quot;hello world&quot;</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x8868;&#x793A;&#xFF0C;&#x5F53;&#x5BF9;&#x8C61;&#x7528;&#x4E8E;&#x5B57;&#x7B26;&#x4E32;&#x52A0;&#x6CD5;&#x65F6;&#xFF0C;&#x4F1A;&#x81EA;&#x52A8;&#x8C03;&#x7528;<code>toString</code>&#x65B9;&#x6CD5;&#x3002;&#x7531;&#x4E8E;&#x81EA;&#x5B9A;&#x4E49;&#x4E86;<code>toString</code>&#x65B9;&#x6CD5;&#xFF0C;&#x6240;&#x4EE5;&#x8FD4;&#x56DE;&#x5B57;&#x7B26;&#x4E32;<code>hello world</code>&#x3002;</p>
<p>&#x6570;&#x7EC4;&#x3001;&#x5B57;&#x7B26;&#x4E32;&#x3001;&#x51FD;&#x6570;&#x3001;Date &#x5BF9;&#x8C61;&#x90FD;&#x5206;&#x522B;&#x90E8;&#x7F72;&#x4E86;&#x81EA;&#x5B9A;&#x4E49;&#x7684;<code>toString</code>&#x65B9;&#x6CD5;&#xFF0C;&#x8986;&#x76D6;&#x4E86;<code>Object.prototype.toString</code>&#x65B9;&#x6CD5;&#x3002;</p>
<pre><code class="lang-javascript">[<span class="hljs-number">1</span>, <span class="hljs-number">2</span>, <span class="hljs-number">3</span>].toString() <span class="hljs-comment">// &quot;1,2,3&quot;</span>

<span class="hljs-string">&apos;123&apos;</span>.toString() <span class="hljs-comment">// &quot;123&quot;</span>

(<span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) </span>{
  <span class="hljs-keyword">return</span> <span class="hljs-number">123</span>;
}).toString()
<span class="hljs-comment">// &quot;function () {</span>
<span class="hljs-comment">//   return 123;</span>
<span class="hljs-comment">// }&quot;</span>

(<span class="hljs-keyword">new</span> <span class="hljs-built_in">Date</span>()).toString()
<span class="hljs-comment">// &quot;Tue May 10 2016 09:11:31 GMT+0800 (CST)&quot;</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;&#x6570;&#x7EC4;&#x3001;&#x5B57;&#x7B26;&#x4E32;&#x3001;&#x51FD;&#x6570;&#x3001;Date &#x5BF9;&#x8C61;&#x8C03;&#x7528;<code>toString</code>&#x65B9;&#x6CD5;&#xFF0C;&#x5E76;&#x4E0D;&#x4F1A;&#x8FD4;&#x56DE;<code>[object Object]</code>&#xFF0C;&#x56E0;&#x4E3A;&#x5B83;&#x4EEC;&#x90FD;&#x81EA;&#x5B9A;&#x4E49;&#x4E86;<code>toString</code>&#x65B9;&#x6CD5;&#xFF0C;&#x8986;&#x76D6;&#x539F;&#x59CB;&#x65B9;&#x6CD5;&#x3002;</p>
<h3 id="tostring-&#x7684;&#x5E94;&#x7528;&#xFF1A;&#x5224;&#x65AD;&#x6570;&#x636E;&#x7C7B;&#x578B;">toString() &#x7684;&#x5E94;&#x7528;&#xFF1A;&#x5224;&#x65AD;&#x6570;&#x636E;&#x7C7B;&#x578B;</h3>
<p><code>Object.prototype.toString</code>&#x65B9;&#x6CD5;&#x8FD4;&#x56DE;&#x5BF9;&#x8C61;&#x7684;&#x7C7B;&#x578B;&#x5B57;&#x7B26;&#x4E32;&#xFF0C;&#x56E0;&#x6B64;&#x53EF;&#x4EE5;&#x7528;&#x6765;&#x5224;&#x65AD;&#x4E00;&#x4E2A;&#x503C;&#x7684;&#x7C7B;&#x578B;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> obj = {};
obj.toString() <span class="hljs-comment">// &quot;[object Object]&quot;</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x8C03;&#x7528;&#x7A7A;&#x5BF9;&#x8C61;&#x7684;<code>toString</code>&#x65B9;&#x6CD5;&#xFF0C;&#x7ED3;&#x679C;&#x8FD4;&#x56DE;&#x4E00;&#x4E2A;&#x5B57;&#x7B26;&#x4E32;<code>object Object</code>&#xFF0C;&#x5176;&#x4E2D;&#x7B2C;&#x4E8C;&#x4E2A;<code>Object</code>&#x8868;&#x793A;&#x8BE5;&#x503C;&#x7684;&#x6784;&#x9020;&#x51FD;&#x6570;&#x3002;&#x8FD9;&#x662F;&#x4E00;&#x4E2A;&#x5341;&#x5206;&#x6709;&#x7528;&#x7684;&#x5224;&#x65AD;&#x6570;&#x636E;&#x7C7B;&#x578B;&#x7684;&#x65B9;&#x6CD5;&#x3002;</p>
<p>&#x7531;&#x4E8E;&#x5B9E;&#x4F8B;&#x5BF9;&#x8C61;&#x53EF;&#x80FD;&#x4F1A;&#x81EA;&#x5B9A;&#x4E49;<code>toString</code>&#x65B9;&#x6CD5;&#xFF0C;&#x8986;&#x76D6;&#x6389;<code>Object.prototype.toString</code>&#x65B9;&#x6CD5;&#xFF0C;&#x6240;&#x4EE5;&#x4E3A;&#x4E86;&#x5F97;&#x5230;&#x7C7B;&#x578B;&#x5B57;&#x7B26;&#x4E32;&#xFF0C;&#x6700;&#x597D;&#x76F4;&#x63A5;&#x4F7F;&#x7528;<code>Object.prototype.toString</code>&#x65B9;&#x6CD5;&#x3002;&#x901A;&#x8FC7;&#x51FD;&#x6570;&#x7684;<code>call</code>&#x65B9;&#x6CD5;&#xFF0C;&#x53EF;&#x4EE5;&#x5728;&#x4EFB;&#x610F;&#x503C;&#x4E0A;&#x8C03;&#x7528;&#x8FD9;&#x4E2A;&#x65B9;&#x6CD5;&#xFF0C;&#x5E2E;&#x52A9;&#x6211;&#x4EEC;&#x5224;&#x65AD;&#x8FD9;&#x4E2A;&#x503C;&#x7684;&#x7C7B;&#x578B;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-built_in">Object</span>.prototype.toString.call(value)
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x8868;&#x793A;&#x5BF9;<code>value</code>&#x8FD9;&#x4E2A;&#x503C;&#x8C03;&#x7528;<code>Object.prototype.toString</code>&#x65B9;&#x6CD5;&#x3002;</p>
<p>&#x4E0D;&#x540C;&#x6570;&#x636E;&#x7C7B;&#x578B;&#x7684;<code>Object.prototype.toString</code>&#x65B9;&#x6CD5;&#x8FD4;&#x56DE;&#x503C;&#x5982;&#x4E0B;&#x3002;</p>
<ul>
<li>&#x6570;&#x503C;&#xFF1A;&#x8FD4;&#x56DE;<code>[object Number]</code>&#x3002;</li>
<li>&#x5B57;&#x7B26;&#x4E32;&#xFF1A;&#x8FD4;&#x56DE;<code>[object String]</code>&#x3002;</li>
<li>&#x5E03;&#x5C14;&#x503C;&#xFF1A;&#x8FD4;&#x56DE;<code>[object Boolean]</code>&#x3002;</li>
<li>undefined&#xFF1A;&#x8FD4;&#x56DE;<code>[object Undefined]</code>&#x3002;</li>
<li>null&#xFF1A;&#x8FD4;&#x56DE;<code>[object Null]</code>&#x3002;</li>
<li>&#x6570;&#x7EC4;&#xFF1A;&#x8FD4;&#x56DE;<code>[object Array]</code>&#x3002;</li>
<li>arguments &#x5BF9;&#x8C61;&#xFF1A;&#x8FD4;&#x56DE;<code>[object Arguments]</code>&#x3002;</li>
<li>&#x51FD;&#x6570;&#xFF1A;&#x8FD4;&#x56DE;<code>[object Function]</code>&#x3002;</li>
<li>Error &#x5BF9;&#x8C61;&#xFF1A;&#x8FD4;&#x56DE;<code>[object Error]</code>&#x3002;</li>
<li>Date &#x5BF9;&#x8C61;&#xFF1A;&#x8FD4;&#x56DE;<code>[object Date]</code>&#x3002;</li>
<li>RegExp &#x5BF9;&#x8C61;&#xFF1A;&#x8FD4;&#x56DE;<code>[object RegExp]</code>&#x3002;</li>
<li>&#x5176;&#x4ED6;&#x5BF9;&#x8C61;&#xFF1A;&#x8FD4;&#x56DE;<code>[object Object]</code>&#x3002;</li>
</ul>
<p>&#x8FD9;&#x5C31;&#x662F;&#x8BF4;&#xFF0C;<code>Object.prototype.toString</code>&#x53EF;&#x4EE5;&#x770B;&#x51FA;&#x4E00;&#x4E2A;&#x503C;&#x5230;&#x5E95;&#x662F;&#x4EC0;&#x4E48;&#x7C7B;&#x578B;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-built_in">Object</span>.prototype.toString.call(<span class="hljs-number">2</span>) <span class="hljs-comment">// &quot;[object Number]&quot;</span>
<span class="hljs-built_in">Object</span>.prototype.toString.call(<span class="hljs-string">&apos;&apos;</span>) <span class="hljs-comment">// &quot;[object String]&quot;</span>
<span class="hljs-built_in">Object</span>.prototype.toString.call(<span class="hljs-literal">true</span>) <span class="hljs-comment">// &quot;[object Boolean]&quot;</span>
<span class="hljs-built_in">Object</span>.prototype.toString.call(<span class="hljs-literal">undefined</span>) <span class="hljs-comment">// &quot;[object Undefined]&quot;</span>
<span class="hljs-built_in">Object</span>.prototype.toString.call(<span class="hljs-literal">null</span>) <span class="hljs-comment">// &quot;[object Null]&quot;</span>
<span class="hljs-built_in">Object</span>.prototype.toString.call(<span class="hljs-built_in">Math</span>) <span class="hljs-comment">// &quot;[object Math]&quot;</span>
<span class="hljs-built_in">Object</span>.prototype.toString.call({}) <span class="hljs-comment">// &quot;[object Object]&quot;</span>
<span class="hljs-built_in">Object</span>.prototype.toString.call([]) <span class="hljs-comment">// &quot;[object Array]&quot;</span>
</code></pre>
<p>&#x5229;&#x7528;&#x8FD9;&#x4E2A;&#x7279;&#x6027;&#xFF0C;&#x53EF;&#x4EE5;&#x5199;&#x51FA;&#x4E00;&#x4E2A;&#x6BD4;<code>typeof</code>&#x8FD0;&#x7B97;&#x7B26;&#x66F4;&#x51C6;&#x786E;&#x7684;&#x7C7B;&#x578B;&#x5224;&#x65AD;&#x51FD;&#x6570;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> type = <span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params">o</span>)</span>{
  <span class="hljs-keyword">var</span> s = <span class="hljs-built_in">Object</span>.prototype.toString.call(o);
  <span class="hljs-keyword">return</span> s.match(<span class="hljs-regexp">/\[object (.*?)\]/</span>)[<span class="hljs-number">1</span>].toLowerCase();
};

type({}); <span class="hljs-comment">// &quot;object&quot;</span>
type([]); <span class="hljs-comment">// &quot;array&quot;</span>
type(<span class="hljs-number">5</span>); <span class="hljs-comment">// &quot;number&quot;</span>
type(<span class="hljs-literal">null</span>); <span class="hljs-comment">// &quot;null&quot;</span>
type(); <span class="hljs-comment">// &quot;undefined&quot;</span>
type(<span class="hljs-regexp">/abcd/</span>); <span class="hljs-comment">// &quot;regex&quot;</span>
type(<span class="hljs-keyword">new</span> <span class="hljs-built_in">Date</span>()); <span class="hljs-comment">// &quot;date&quot;</span>
</code></pre>
<p>&#x5728;&#x4E0A;&#x9762;&#x8FD9;&#x4E2A;<code>type</code>&#x51FD;&#x6570;&#x7684;&#x57FA;&#x7840;&#x4E0A;&#xFF0C;&#x8FD8;&#x53EF;&#x4EE5;&#x52A0;&#x4E0A;&#x4E13;&#x95E8;&#x5224;&#x65AD;&#x67D0;&#x79CD;&#x7C7B;&#x578B;&#x6570;&#x636E;&#x7684;&#x65B9;&#x6CD5;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> type = <span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params">o</span>)</span>{
  <span class="hljs-keyword">var</span> s = <span class="hljs-built_in">Object</span>.prototype.toString.call(o);
  <span class="hljs-keyword">return</span> s.match(<span class="hljs-regexp">/\[object (.*?)\]/</span>)[<span class="hljs-number">1</span>].toLowerCase();
};

[<span class="hljs-string">&apos;Null&apos;</span>,
 <span class="hljs-string">&apos;Undefined&apos;</span>,
 <span class="hljs-string">&apos;Object&apos;</span>,
 <span class="hljs-string">&apos;Array&apos;</span>,
 <span class="hljs-string">&apos;String&apos;</span>,
 <span class="hljs-string">&apos;Number&apos;</span>,
 <span class="hljs-string">&apos;Boolean&apos;</span>,
 <span class="hljs-string">&apos;Function&apos;</span>,
 <span class="hljs-string">&apos;RegExp&apos;</span>
].forEach(<span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params">t</span>) </span>{
  type[<span class="hljs-string">&apos;is&apos;</span> + t] = <span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params">o</span>) </span>{
    <span class="hljs-keyword">return</span> type(o) === t.toLowerCase();
  };
});

type.isObject({}) <span class="hljs-comment">// true</span>
type.isNumber(<span class="hljs-literal">NaN</span>) <span class="hljs-comment">// true</span>
type.isRegExp(<span class="hljs-regexp">/abc/</span>) <span class="hljs-comment">// true</span>
</code></pre>
<h3 id="objectprototypetolocalestring">Object.prototype.toLocaleString()</h3>
<p><code>Object.prototype.toLocaleString</code>&#x65B9;&#x6CD5;&#x4E0E;<code>toString</code>&#x7684;&#x8FD4;&#x56DE;&#x7ED3;&#x679C;&#x76F8;&#x540C;&#xFF0C;&#x4E5F;&#x662F;&#x8FD4;&#x56DE;&#x4E00;&#x4E2A;&#x503C;&#x7684;&#x5B57;&#x7B26;&#x4E32;&#x5F62;&#x5F0F;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> obj = {};
obj.toString(obj) <span class="hljs-comment">// &quot;[object Object]&quot;</span>
obj.toLocaleString(obj) <span class="hljs-comment">// &quot;[object Object]&quot;</span>
</code></pre>
<p>&#x8FD9;&#x4E2A;&#x65B9;&#x6CD5;&#x7684;&#x4E3B;&#x8981;&#x4F5C;&#x7528;&#x662F;&#x7559;&#x51FA;&#x4E00;&#x4E2A;&#x63A5;&#x53E3;&#xFF0C;&#x8BA9;&#x5404;&#x79CD;&#x4E0D;&#x540C;&#x7684;&#x5BF9;&#x8C61;&#x5B9E;&#x73B0;&#x81EA;&#x5DF1;&#x7248;&#x672C;&#x7684;<code>toLocaleString</code>&#xFF0C;&#x7528;&#x6765;&#x8FD4;&#x56DE;&#x9488;&#x5BF9;&#x67D0;&#x4E9B;&#x5730;&#x57DF;&#x7684;&#x7279;&#x5B9A;&#x7684;&#x503C;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> person = {
  toString: <span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) </span>{
    <span class="hljs-keyword">return</span> <span class="hljs-string">&apos;Henry Norman Bethune&apos;</span>;
  },
  toLocaleString: <span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) </span>{
    <span class="hljs-keyword">return</span> <span class="hljs-string">&apos;&#x767D;&#x6C42;&#x6069;&apos;</span>;
  }
};

person.toString() <span class="hljs-comment">// Henry Norman Bethune</span>
person.toLocaleString() <span class="hljs-comment">// &#x767D;&#x6C42;&#x6069;</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;<code>toString()</code>&#x65B9;&#x6CD5;&#x8FD4;&#x56DE;&#x5BF9;&#x8C61;&#x7684;&#x4E00;&#x822C;&#x5B57;&#x7B26;&#x4E32;&#x5F62;&#x5F0F;&#xFF0C;<code>toLocaleString()</code>&#x65B9;&#x6CD5;&#x8FD4;&#x56DE;&#x672C;&#x5730;&#x7684;&#x5B57;&#x7B26;&#x4E32;&#x5F62;&#x5F0F;&#x3002;</p>
<p>&#x76EE;&#x524D;&#xFF0C;&#x4E3B;&#x8981;&#x6709;&#x4E09;&#x4E2A;&#x5BF9;&#x8C61;&#x81EA;&#x5B9A;&#x4E49;&#x4E86;<code>toLocaleString</code>&#x65B9;&#x6CD5;&#x3002;</p>
<ul>
<li>Array.prototype.toLocaleString()</li>
<li>Number.prototype.toLocaleString()</li>
<li>Date.prototype.toLocaleString()</li>
</ul>
<p>&#x4E3E;&#x4F8B;&#x6765;&#x8BF4;&#xFF0C;&#x65E5;&#x671F;&#x7684;&#x5B9E;&#x4F8B;&#x5BF9;&#x8C61;&#x7684;<code>toString</code>&#x548C;<code>toLocaleString</code>&#x8FD4;&#x56DE;&#x503C;&#x5C31;&#x4E0D;&#x4E00;&#x6837;&#xFF0C;&#x800C;&#x4E14;<code>toLocaleString</code>&#x7684;&#x8FD4;&#x56DE;&#x503C;&#x8DDF;&#x7528;&#x6237;&#x8BBE;&#x5B9A;&#x7684;&#x6240;&#x5728;&#x5730;&#x57DF;&#x76F8;&#x5173;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> date = <span class="hljs-keyword">new</span> <span class="hljs-built_in">Date</span>();
date.toString() <span class="hljs-comment">// &quot;Tue Jan 01 2018 12:01:33 GMT+0800 (CST)&quot;</span>
date.toLocaleString() <span class="hljs-comment">// &quot;1/01/2018, 12:01:33 PM&quot;</span>
</code></pre>
<h3 id="objectprototypehasownproperty">Object.prototype.hasOwnProperty()</h3>
<p><code>Object.prototype.hasOwnProperty</code>&#x65B9;&#x6CD5;&#x63A5;&#x53D7;&#x4E00;&#x4E2A;&#x5B57;&#x7B26;&#x4E32;&#x4F5C;&#x4E3A;&#x53C2;&#x6570;&#xFF0C;&#x8FD4;&#x56DE;&#x4E00;&#x4E2A;&#x5E03;&#x5C14;&#x503C;&#xFF0C;&#x8868;&#x793A;&#x8BE5;&#x5B9E;&#x4F8B;&#x5BF9;&#x8C61;&#x81EA;&#x8EAB;&#x662F;&#x5426;&#x5177;&#x6709;&#x8BE5;&#x5C5E;&#x6027;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> obj = {
  p: <span class="hljs-number">123</span>
};

obj.hasOwnProperty(<span class="hljs-string">&apos;p&apos;</span>) <span class="hljs-comment">// true</span>
obj.hasOwnProperty(<span class="hljs-string">&apos;toString&apos;</span>) <span class="hljs-comment">// false</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;&#x5BF9;&#x8C61;<code>obj</code>&#x81EA;&#x8EAB;&#x5177;&#x6709;<code>p</code>&#x5C5E;&#x6027;&#xFF0C;&#x6240;&#x4EE5;&#x8FD4;&#x56DE;<code>true</code>&#x3002;<code>toString</code>&#x5C5E;&#x6027;&#x662F;&#x7EE7;&#x627F;&#x7684;&#xFF0C;&#x6240;&#x4EE5;&#x8FD4;&#x56DE;<code>false</code>&#x3002;</p>
<h2 id="&#x53C2;&#x8003;&#x94FE;&#x63A5;">&#x53C2;&#x8003;&#x94FE;&#x63A5;</h2>
<ul>
<li>Axel Rauschmayer, <a href="http://www.2ality.com/2013/08/protecting-objects.html" target="_blank" rel="nofollow">Protecting objects in JavaScript</a></li>
<li>kangax, <a href="http://perfectionkills.com/understanding-delete/" target="_blank" rel="nofollow">Understanding delete</a></li>
<li>Jon Bretman, <a href="http://techblog.badoo.com/blog/2013/11/01/type-checking-in-javascript/" target="_blank" rel="nofollow">Type Checking in JavaScript</a></li>
<li>Cody Lindley, <a href="http://tech.pro/tutorial/1671/thinking-about-ecmascript-5-parts" target="_blank" rel="nofollow">Thinking About ECMAScript 5 Parts</a></li>
<li>Bjorn Tipling, <a href="http://bjorn.tipling.com/advanced-objects-in-javascript" target="_blank" rel="nofollow">Advanced objects in JavaScript</a></li>
<li>Javier M&#xE1;rquez, <a href="http://arqex.com/967/javascript-properties-enumerable-writable-configurable" target="_blank" rel="nofollow">JavaScript properties are enumerable, writable and configurable</a></li>
<li>Sella Rafaeli, <a href="http://www.sellarafaeli.com/blog/native_javascript_data_binding" target="_blank" rel="nofollow">Native JavaScript Data-Binding</a>: &#x4F7F;&#x7528;&#x5B58;&#x53D6;&#x51FD;&#x6570;&#x5B9E;&#x73B0;model&#x4E0E;view&#x7684;&#x53CC;&#x5411;&#x7ED1;&#x5B9A;</li>
<li>Lea Verou, <a href="http://lea.verou.me/2015/08/copying-properties-the-robust-way/" target="_blank" rel="nofollow">Copying object properties, the robust way</a></li>
</ul>




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